client/src/app/shared/user-subscription/user-subscription.service.ts

   1 import { bufferTime, catchError, filter, first, map, share, switchMap } from 'rxjs/operators'
   2 import { HttpClient, HttpParams } from '@angular/common/http'
   3 import { Injectable } from '@angular/core'
   4 import { ResultList } from '../../../../../shared'
   5 import { environment } from '../../../environments/environment'
   6 import { RestExtractor, RestService } from '../rest'
   7 import { Observable, ReplaySubject, Subject } from 'rxjs'
   8 import { VideoChannel } from '@app/shared/video-channel/video-channel.model'
   9 import { VideoChannelService } from '@app/shared/video-channel/video-channel.service'
  10 import { VideoChannel as VideoChannelServer } from '../../../../../shared/models/videos'
  11 import { ComponentPagination } from '@app/shared/rest/component-pagination.model'
  12
  13 type SubscriptionExistResult = { [ uri: string ]: boolean }
  14
  15 @Injectable()
  16 export class UserSubscriptionService {
  17   static BASE_USER_SUBSCRIPTIONS_URL = environment.apiUrl + '/api/v1/users/me/subscriptions'
  18
  19   // Use a replay subject because we "next" a value before subscribing
  20   private existsSubject: Subject<string> = new ReplaySubject(1)
  21   private readonly existsObservable: Observable<SubscriptionExistResult>
  22
  23   constructor (
  24     private authHttp: HttpClient,
  25     private restExtractor: RestExtractor,
  26     private restService: RestService
  27   ) {
  28     this.existsObservable = this.existsSubject.pipe(
  29       bufferTime(500),
  30       filter(uris => uris.length !== 0),
  31       switchMap(uris => this.doSubscriptionsExist(uris)),
  32       share()
  33     )
  34   }
  35
  36   deleteSubscription (nameWithHost: string) {
  37     const url = UserSubscriptionService.BASE_USER_SUBSCRIPTIONS_URL + '/' + nameWithHost
  38
  39     return this.authHttp.delete(url)
  40                .pipe(
  41                  map(this.restExtractor.extractDataBool),
  42                  catchError(err => this.restExtractor.handleError(err))
  43                )
  44   }
  45
  46   addSubscription (nameWithHost: string) {
  47     const url = UserSubscriptionService.BASE_USER_SUBSCRIPTIONS_URL
  48
  49     const body = { uri: nameWithHost }
  50     return this.authHttp.post(url, body)
  51                .pipe(
  52                  map(this.restExtractor.extractDataBool),
  53                  catchError(err => this.restExtractor.handleError(err))
  54                )
  55   }
  56
  57   listSubscriptions (componentPagination: ComponentPagination): Observable<ResultList<VideoChannel>> {
  58     const url = UserSubscriptionService.BASE_USER_SUBSCRIPTIONS_URL
  59
  60     const pagination = this.restService.componentPaginationToRestPagination(componentPagination)
  61
  62     let params = new HttpParams()
  63     params = this.restService.addRestGetParams(params, pagination)
  64
  65     return this.authHttp.get<ResultList<VideoChannelServer>>(url, { params })
  66                .pipe(
  67                  map(res => VideoChannelService.extractVideoChannels(res)),
  68                  catchError(err => this.restExtractor.handleError(err))
  69                )
  70   }
  71
  72   doesSubscriptionExist (nameWithHost: string) {
  73     this.existsSubject.next(nameWithHost)
  74
  75     return this.existsObservable.pipe(first())
  76   }
  77
  78   private doSubscriptionsExist (uris: string[]): Observable<SubscriptionExistResult> {
  79     const url = UserSubscriptionService.BASE_USER_SUBSCRIPTIONS_URL + '/exist'
  80     let params = new HttpParams()
  81
  82     params = this.restService.addObjectParams(params, { uris })
  83
  84     return this.authHttp.get<SubscriptionExistResult>(url, { params })
  85                .pipe(catchError(err => this.restExtractor.handleError(err)))
  86   }
  87 }